- Software and digital services
- Web browsers
ERR_NETWORK_CHANGED
ERR_NETWORK_CHANGED in Google Chrome: the network changed while loading
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
Your device disconnected from the network or joined another one while the page was loading. Reload once the connection is stable and check whether the device keeps switching Wi-Fi networks or losing signal.
Safety first
Stop and check this first
- If the error appears while submitting a form or a payment, check whether it was recorded before repeating it.
Safe checks you can perform
- Reload with a stable connection
- Jumps between networks
- Router stability
- Router disconnection log
Leave these tasks to a qualified professional
- Do not attempt this professional task: Review the router log
- Do not attempt this professional task: Line check
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Review the router log
What they doThe administrator or provider compares the error times with the disconnections recorded by the router.
They must show youthe disconnection entries.
In writingthe cause of the drops and the fix.
Line check
What they doThe internet service provider tests the line if the router disconnects with no local cause.
They must show youthe test result.
In writingthe fault found.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Reload with a stable connection
- Who:
- you.
- How:
- wait until the network indicator is steady and reload the page.
- Result that matters:
- whether it fails again with a stable connection.
- If it loads first time:
- it was a one-off change; nothing else is needed.
- If it comes back:
- keep watching the device's connection.
- Evidence to keep:
- time of each occurrence of the error.
Evidence: Google Chrome Help - Get help with common error messages in Chrome · Google Chrome Help - Fix connection and loading errors in Chrome
Jumps between networks
- Who:
- you.
- How:
- watch the network icon or Wi-Fi settings while browsing and see whether the network name changes or the signal drops.
- Result that matters:
- whether the device changes network or loses the connection.
- If it switches between known networks:
- it indicates the jump causes the error; stay on a single network.
- If it does not change network but loses signal:
- it points to the router or coverage.
- Evidence to keep:
- names of the networks involved and times of the drops.
Evidence: Google Chrome Help - Get help with common error messages in Chrome
Router stability
- Who:
- you.
- How:
- restart the modem and router and see whether the drops repeat; if they continue, contact your provider.
- Result that matters:
- whether the drops stop after the restart.
- If they stop:
- the router was the source.
- If they persist:
- take the times to the provider so they check the line.
- Evidence to keep:
- drop times and ticket number.
Evidence: Google Chrome Help - Fix connection and loading errors in Chrome
Router disconnection log
- Who:
- the network administrator or the provider.
- How:
- review the router or access point log for the reported times.
- Result that matters:
- whether there are disconnections or restarts at those times.
- If they match:
- the router or the line causes the network change.
- If nothing is logged:
- it indicates a problem with the device's network adapter.
- Evidence to keep:
- a log extract with the times.
Only the network administrator or the provider. If you do not manage the router, do not tamper with its configuration.
Evidence: Google Chrome Help - Get help with common error messages in Chrome
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Software and digital services
- Brand
- Google Chrome
- Product type
- Web browsers
Known code variants
- ERR_NETWORK_CHANGED
- ERR_NETWORK_CHANGED (-21)
- ERR_NETWORK_CHANGED Chrome
- net::ERR_NETWORK_CHANGED
What it means
Chromium defines ERR_NETWORK_CHANGED (-21) simply as the network changed. Chrome Help makes it concrete: the device disconnected from the network or connected to a new network while loading the page. It does not indicate a site fault. It indicates that your device's connection did not hold during the load, through a Wi-Fi drop, a switch between networks or a router restart.
Warnings and stop conditions
- Loweditorial warning
If the error appears while submitting a form or a payment, check whether it was recorded before repeating it.
Evidence: Google Chrome Help - Get help with common error messages in Chrome
Symptoms and causes
Probable causes · in order
- Brief network dropCommon
A short loss of Wi-Fi or cable. It affects any site loading at that moment.
Evidence: Google Chrome Help - Get help with common error messages in Chrome
- Switching between networksPossible
The device moves from one network to another (for example, from one Wi-Fi to another or to cable) during the load.
Evidence: Google Chrome Help - Get help with common error messages in Chrome
Virtual technician
Does ERR_NETWORK_CHANGED still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Chromium source - net/base/net_error_list.h (network error list)
The Chromium Authors · 2026 · official_doc
- 2
Google Chrome Help - Get help with common error messages in Chrome
Google · 2026 · official_doc
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